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|  MIL-C-11272D
w/Amendment 1
4.6.11 Moisture resistance (see 3.14). Capacitors shall be tested in accordance with method 106 of MIL-STD-
202. The following details and exceptions shall apply:
*
a. Mounting: Capacitors shall be mounted by their terminals in a manner that will keep the capacitor body
from touching the test fixture.
b.
Initial measurements - Not applicable.
c.
Polarization and load - Not applicable.
d.
Final measurements - The insulation resistance shall be measured as specified in 4.6.4 at a temperature of
25 5C and a relative humidity of 90 to 95 percent. Between 4 and 24 hours after this measurement,
capacitors shall be visually examined for evidence of corrosion or mechanical damage; the dielectric
withstanding voltage, insulation resistance, capacitance, and dissipation factor shall then be measured as
specified in 4.6.2, 4.6.4, 4.6.5, and 4.6.6, respectively, at a temperature of 25 5C and a relative
humidity of 50 5 percent.
4.6.12 Life (see 3.15).
4.6.12.1 Qualification inspection. Capacitance shall be measured as specified in 4.6.5 at a temperature of 125
*
+4,-0C. The capacitors shall then be subjected to a minimum of 150 percent - 2 percent of the dc rated voltage
(see 3.1) for 2,000 hours at a temperature of 125 +4, -0C. The surge current shall not exceed 50 mA. The
insulation resistance, capacitance, and dissipation factor shall be measured as specified in 4.6.4, 4.6.5, and 4.6.6,
respectively, at a temperature of 125 +4,-0C. The capacitors shall then be returned to the inspection conditions
specified in 4.3, and the insulation resistance, capacitance, and dissipation factor shall be measured as specified in
4.6.4, 4.6.5, and 4.6.6, respectively. Capacitors shall then be visually examined for evidence of corrosion or
mechanical damage.
4.6.12.2 Conformance inspection.
4.6.12.2.1 Performance check (see 3.15.1). Capacitors shall be tested as specified in 4.6.12.1, except that the
duration of the test shall be 250 hours and that only the measurements at the inspection conditions specified in 4.3
need be made (see 3.15.1 and table IV).
4.6.12.2.2 Continuation test. Capacitors which have been subjected to the 250-hour performance-check specified
in 4.6.12.2.1 shall be tested for an additional period of 1,750 hours in accordance with 4.6.12.1, with voltage applied
with the same polarity as when subjected to the performance check (see 3.15.2 and table VII).
4.6.13 Solderability (see 3.16). Capacitors shall be tested in accordance with method 208 of MIL-STD-202.
4.6.14 Terminal strength (see 3.17).
4.6.14.1 Pull test. The body of the capacitor shall be secured, and each terminal in turn shall be subjected to a
gradually applied axial-pull of 5 pounds maintained at its maximum value for 5 seconds.
4.6.14.2 Twisting test. All terminals shall be bent through 90 at a point .25 inch from the body of the capacitor,
with the radius of curvature at the bend approximately .031 inch. The terminals shall be clamped, to within
.047 .016 inch of the bend on the side between the bend and the remaining portion of the lead, away from the
body. The body of the capacitor shall then be rotated about the original axis of the bent terminal through 360 in
alternating directions for three such 360 rotations, at the rate of approximately 5 seconds per rotation. The
capacitors shall then be examined for evidence of loosening or rupture, and damage to the terminals or seal.
NOTE: For the purpose of this test, the original axis is considered to be the axial position of all leads.
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